Broadband Achromatic Anomalous Mirror in Near-IR and Visible Frequency Ranges

Andrei Nemilentsau, Tony Low

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

An anomalous achromatic mirror operating in the near-IR and visible frequency ranges was designed using an array of metal-insulator-metal (MIM) resonators. An incident wave interacting with the MIM resonator experiences phase shift that is equal to the optical path traveled by the gap plasmon excited by the wave. A phase gradient along the mirror surface is created through the difference in plasmon optical paths in the resonators of varying lengths. In a frequency region well below the plasma frequency of metal, the phase gradient is a linear function of frequency, and thus the mirror operates in the achromatic regime; that is, the reflection angle does not depend on the radiation frequency. Using silver-air-silver resonators, we predicted that the mirror can steer a normally incident beam to angles as large as 40° with high radiation efficiency (exceeding 98%) and small Joule losses (below 10%). Our study indicates that it is feasible to create an efficient broadband anomalous mirror.

Original languageEnglish (US)
Pages (from-to)1646-1652
Number of pages7
JournalACS Photonics
Volume4
Issue number7
DOIs
StatePublished - Jul 19 2017

Fingerprint

Mirrors
frequency ranges
Metals
mirrors
Resonators
broadband
resonators
metals
optical paths
Silver
silver
insulators
Radiation
gradients
plasma frequencies
radiation
Phase shift
phase shift
Air
Plasmas

Keywords

  • achromatic reflection
  • anomalous mirror
  • gap plasmons
  • gradient metasurface
  • metal-insulator-metal resonators

Cite this

Broadband Achromatic Anomalous Mirror in Near-IR and Visible Frequency Ranges. / Nemilentsau, Andrei; Low, Tony.

In: ACS Photonics, Vol. 4, No. 7, 19.07.2017, p. 1646-1652.

Research output: Contribution to journalArticle

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abstract = "An anomalous achromatic mirror operating in the near-IR and visible frequency ranges was designed using an array of metal-insulator-metal (MIM) resonators. An incident wave interacting with the MIM resonator experiences phase shift that is equal to the optical path traveled by the gap plasmon excited by the wave. A phase gradient along the mirror surface is created through the difference in plasmon optical paths in the resonators of varying lengths. In a frequency region well below the plasma frequency of metal, the phase gradient is a linear function of frequency, and thus the mirror operates in the achromatic regime; that is, the reflection angle does not depend on the radiation frequency. Using silver-air-silver resonators, we predicted that the mirror can steer a normally incident beam to angles as large as 40° with high radiation efficiency (exceeding 98{\%}) and small Joule losses (below 10{\%}). Our study indicates that it is feasible to create an efficient broadband anomalous mirror.",
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